Lack of demand from major investors, such as university endowments, and shrinking pipeline, worry Facebook founder who is now a VC. Investors have become more risk averse after major losses from risky bets and there are fewer opportunities to fund companies seeking long-term viability and IPO for payout. Most are looking to flip the companies to larger companies seeking technology. He is very negative about the big bets that VC's have made on green technology start ups. Most will not pay back investors. This raises the general question about where our growth will come from in the future.